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. Author manuscript; available in PMC: 2017 Sep 6.
Published in final edited form as: Inorg Chem. 2016 Aug 8;55(17):8321–8330. doi: 10.1021/acs.inorgchem.6b00388

Figure 4. Possible pathways for CO2 reduction.

Figure 4

CO2 activation at one FeS face of the E2 state of FeMo-co is shown. The E2 state is proposed to contain a single Fe-hydride and a proton bound to a sulfide shown bound to one face of FeMo-co. Reduction to formate (blue box) can go by either a direct hydride transfer or an associative pathway. A pathway to formation of CO and CH4 is shown in the green box. Six additional electrons and protons are added to the bottom structure to achieve reduction to CH4.